Descriptive accounts are presented of statistical procedures which were applied to the analysis of mass emissions data as determined from aircraft exhaust emissions measurements. Results of these analyses are discussed, with an emphasis on the significance of the results within the context of the data base available. In essence, the purpose of the report is to isolate the causes or sources of both fixed and random contributions to the variability observed in the data and to estimate, wherever possible, the magnitudes of these contributions. Specific questions of broad interest are addressed and statistical inferences drawn with respect to these questions. (Author)